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Posted: **Sun Sep 05, 2021 5:05 pm**

: Question 1 10 Marks A Big It Company Has Many Branches Around The World Suppose That The Average Number Of Customers 1 (28.26 KiB) Viewed 175 times

Question 1 (10 marks) A big IT company has many branches around the world. Suppose that the average number of customers for all company branches is 120 per day with a standard deviation of 25. If we took a sample of 25 branches, calculate the following probabilities when the number of customers is normally distributed
2. Find the interval that contains the middle 99.7% of the number of customers. (1.5)
THE NORMAL DISTRIBUTION FUNCTION If Z has a normal distribution with mean 0 and variance I then, for each value of z, the table gives the value of 0(2), where 0(z) = P(Z